Effects of thyroid hormones on the transcription and structure of the malic enzyme gene in rat liver
Genetics
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Abstract
Functionally different chromatin fractions have been isolated whose DNAs are used in hybridization with32P-labeled fragments of the malic enzyme gene. In thyroidectomized animals, homologs of the malic enzyme gene are found predominantly in the transcriptionally inactive chromatin fraction. In triiodothyronine-treated rats, the most intense hybridization signals are obtained from the chromatin fraction DNA hypersensitive to micrococcal nuclease and from DNA associated with the nuclear matrix. Thus, induction of the malic enzyme mRNA with triiodothyronine is attended by rearrangements at the higher levels of DNA packing.
Key Words
thyroid hormones malic enzyme gene structural organization transcriptionPreview
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